Compilare: main.cpp: In function 'int main()': main.cpp:16:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mz.in", "r", stdin); ^ main.cpp:17:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mz.out", "w", stdout); ^ main.cpp:18:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); fgetc(stdin); ^ main.cpp:20:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(j=1; j<=M; ++j) {scanf("%c", &c); Map[i][j]=c-'0';} ^